sulfuric acid T=60 - 85°C; 0.75 h;

1: Na2SO4; aq. HCl; H2NOH*HCl / 2 h / 80 - 90 °C 2: H2SO4 / 0.25 h / 80 °C View Scheme

1: With water; sodium hydroxide T=110°C; Pfitzinger reaction; P=4500.45 Torr; 0.25 h; Microwave irradiation; 2: in water T=190 - 200°C; Pfitzinger reaction; P=12001.2 - 13501.4 Torr; 0.0833333 h; Microwave irradiation;